Improvement in grinding-mills



A. H. sEARFoss.

Grinding Mill.

No. 37,793. 'Patented Feb. 24, i863.

,WL Y 1 UNITED STATES PATENT OFFICE.

AMOS H. SEARFOSS, OF NEWARK, NEW JERSEY, ASSIGNOR TO ANNA MARIA HYDE, OF SAME PLACE.

lMPROVEMENT IN GRINDlNG-MILLS.

Specification forming part of Letters Patent No. 37,793, dated February 24, 1863.

To all uhom it may concern:

Be it known that I, AMos H. SEAREoss, of Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Grinding-Mills and I- do hereby declare that the following is a full and exact description thereof', reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to that class of mills the grinding-surfaces of which are vertical or net horizontal, and my improvements in vertical mills consist, rst, in securing the running adjustable stone upon one end of the drivingshaft, and holding said stone as described 5 second, in the employment of this shaft for supporting and holding one end of an independent feeding shaft or screw for carrying the material to be ground between the grinding-surfaces, and for rotating said feedshaft, as described, third, in the manner of holding the stationary or bed stone in a xed position; and, fourth, in the employment of the frame-work of the mill for a recess for the feed-screw for supplying the material to be ground; and, iifth, the regulating such supply to the screw by an adjustable sliding gate, operated as described. (See drawings.)

Figure I shows a vertical side elevation of the mill. Fig. II shows a section through the same; and Fig. III shows an elevation of the feeding end of the mill, partly in section.

A shows the framework, which I cast whole; B, the runningsshaft; G, the drivingpulley; D, the outer covering ofthe mill, made to separate in the middle, as shown at c. E shows the running-stone, F the stationary or bed stone, and G the outlet for the pulverized material.

a shows the carrier-plate for the running-- stone, secured to the driving-shaft by a key and slot. The stone being fixed in a curb, b, by plaster-of-paris or other proper cement, I then fasten the curb to the carrier-plate by means 0f the screw-belts d. The outer shaft, B, takes against an adj Listing-screw, e, for regulating the product. Into the inner end of this shaft I form a fiat-sided recess, f, for receivin g the inner end of the screw feed-shaft, g, which end is made to lit the recess f,by which it is supported and rotated. This screwshaft passes through the eye of the bed-stone,

and is exten led beyond it to a proper distance into a channel or recess, s, formed in the framework of the mill, and is provided with a proper journal, t, at its outer end, which rests in a bearing in the end of the recess. Thisjournal takes against an adj Listing-screw, lz., similar to that at the other end of the mill. It follows that by the turning of the driving-shaft the screw is also rotated. u shows a cap covering and confining the outer end of the screw, by the removal of which (with the hopper-box) the screw may be readily withdrawn for removing the stones for dressing, when neces sary. The stationary or bed stone is secured in a carrying curbnl, similar t0 that for the running-stone in the curb b, but this curb and stone are held stationary and fast by means of the horizontal arms k, and by the studs and screw-bolts le', secured to the frame-work.

The regulation 0f the feed I effect as follows: At l, I show a vertical sliding gate in proper guides attached to the stationary curb t', and covering, when closed, a great part of the oritice in the curb outside of the feed-screw, the thread ofwhich is cut away immediately under and around at the point below the gate, as shown at o. This gate is provided with a horizontal projection for receiving the vertical screw m, by which the gate is regulated up or down, as necessary. ushows a guide and beam for the upper end of the screw, where is also shown the thumb-piece by means of which the screw is turned. p shows the hopper, which is removed in Fig. III, as is also the cap eovering the outer end of the screw.

What I claim as new, and desire to secure by Letters Patent, is

l. Constructing a verticalmill, with itsbedstone secured and held to the frame-work in the manner described, combined with a feeding-screw and feeding apparatus, arranged, constructed, and operated as described.

2. The employment of a feed-screw for a vertical grinding-mill when such screw is made distinct from the drivingshaft, but is to be rotated thereby, and being at the same time adjustable and removable, and arranged as described.

AMOS H. SEARFOSS. Witnesses J oHN THATGIIER, G. W. BENJAMIN. 

